On a warmer planet, 3 million years ago, sea levels were higher, and waves lapped what are now sandy cliffs in South Africa. Lamont-Doherty scientist Maureen Raymo is studying such ancient shorelines to understand how high the seas rose then, and how high they might climb in the future. http://blogs.ei.columbia.edu/2012/07/09/investigating-the-world%E2%80%99s-oceans-pole-to-pole-and-deep-below-the-bottom/
